noun

• An Ethiopian king or prince.
• A headland; a cape.
• A surname.
• (linguistics) Initialism of redundant acronym syndrome.
• (military, nautical) Initialism of replenishment at sea.
• (firearms) Abbreviation of rail accessory system.
• (neurology) Initialism of reticular activating system.
• (law enforcement) Initialism of reasonable articulable suspicion.
• (medicine) Initialism of renin-angiotensin system. [(endocrinology) A collection of hormones involved in the regulation of the body's blood pressure and water content.]
• (computing) Initialism of remote access service.